Question

An air tank that is 500 mL is 80% oxygen

and 20% nitrogen. What is the amount of
oxygen in milliliters in a 200 ml air tank
that contains the same ratio?

Answer 1

In 500 mL
80% oxygen: 400 mL oxygen
20% nitrogen: 100 mL nitrogen

In 200 mL
80% oxygen: 160 mL oxygen
20% nitrogen: 40 mL nitrogen